| 摘要 |
PCT No. PCT/DE87/00109 Sec. 371 Date Aug. 31, 1988 Sec. 102(e) Date Aug. 31, 1988 PCT Filed Mar. 12, 1986 PCT Pub. No. WO87/05756 PCT Pub. Date Sep. 24, 1987.In a circuit arrangement for operating a multiphase synchronous motor (10) on a direct current voltage main current valves (15-18), which are successively actuated via a ring counter (38), are connected in series with the phases (w1-w4) of the armature winding (12) of the motor (10). A ring counter switching device (19) advances the ring counter (38) by pulses derived from the comparison of in voltages dropped across two blocked current valves (15-18). To restrict the self control range of the motor to an angular range which is much smaller than half a period, of the voltage drop decreasing in the course of time is additionally compared with a set voltage (k US) by the ring counter switching device (19) and the ring counter advancement is enabled only for as long as this voltage drop is greater than the set voltage value. |
